Happy Pillow Fight Day!

Mass public pillow fights have been arranged in numerous cities around the world as part of the 'Urban Playground Movement' which facilitates free, public non-commercial events.

By compiled from wire photos

on April 6, 2013 7:02 PM

Photo: Matt Dunham/Associated Press

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Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England. Mass public pillow fights have been arranged in numerous cities around the world as part of the 'Urban Playground Movement' which facilitates free, public non-commercial events. less

Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England. Mass public pillow fights have been arranged in numerous cities around ... more

Photo: Oli Scarff, Getty Images

Revellers take part in a giant pillow fight in Trafalgar Square on... Photo-4433526.59865 - Houston Chronicle

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Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England. Mass public pillow fights have been arranged in numerous cities around the world as part of the 'Urban Playground Movement' which facilitates free, public non-commercial events. less

Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England. Mass public pillow fights have been arranged in numerous cities around ... more

Photo: Oli Scarff, Getty Images

Revellers take part in a giant pillow fight in Trafalgar Square on... Photo-4433527.59865 - Houston Chronicle

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Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England. Mass public pillow fights have been arranged in numerous cities around the world as part of the 'Urban Playground Movement' which facilitates free, public non-commercial events. less

Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England. Mass public pillow fights have been arranged in numerous cities around ... more

Photo: Oli Scarff, Getty Images

Revellers take part in a giant pillow fight in Trafalgar Square on... Photo-4433529.59865 - Houston Chronicle

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Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England.

Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England.

Photo: Oli Scarff, Getty Images

Revellers take part in a giant pillow fight in Trafalgar Square on... Photo-4433531.59865 - Houston Chronicle

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Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England.

Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England.

Photo: Oli Scarff, Getty Images

Revellers take part in a giant pillow fight in Trafalgar Square on... Photo-4433532.59865 - Houston Chronicle

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Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day.

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day.

Photo: CARL COURT, AFP/Getty Images

Revellers take part in a mass pillow fight in Trafalgar Square in... Photo-4433533.59865 - Houston Chronicle

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Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day.

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day.

Photo: CARL COURT, AFP/Getty Images

Revellers take part in a mass pillow fight in Trafalgar Square in... Photo-4433535.59865 - Houston Chronicle

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A young man reacts as he takes part in the mass pillow fight event in Vienna, Austria on April 6, 2013 as part of the International Pillow Fight Day.

A young man reacts as he takes part in the mass pillow fight event in Vienna, Austria on April 6, 2013 as part of the International Pillow Fight Day.

Photo: ALEXANDER KLEIN, AFP/Getty Images

A young man reacts as he takes part in the mass pillow fight event... Photo-4433536.59865 - Houston Chronicle

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Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England. Mass public pillow fights have been arranged in numerous cities around the world as part of the 'Urban Playground Movement' which facilitates free, public non-commercial events. less

Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England. Mass public pillow fights have been arranged in numerous cities around ... more

Photo: Oli Scarff, Getty Images

Revellers take part in a giant pillow fight in Trafalgar Square on... Photo-4433537.59865 - Houston Chronicle

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Revellers prepare to take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England. Mass public pillow fights have been arranged in numerous cities around the world as part of the 'Urban Playground Movement' which facilitates free, public non-commercial events. less

Revellers prepare to take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England. Mass public pillow fights have been arranged in numerous ... more

Photo: Oli Scarff, Getty Images

Revellers prepare to take part in a giant pillow fight in Trafalgar... Photo-4433538.59865 - Houston Chronicle

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Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England.

Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England.

Photo: Oli Scarff, Getty Images

Revellers take part in a giant pillow fight in Trafalgar Square on... Photo-4433539.59865 - Houston Chronicle

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A pillow flies over Vienna's Maria-Theresien-Square during the mass pillow fight event in Vienna, Austria on April 6, 2013, the International Pillow Fight Day.

A pillow flies over Vienna's Maria-Theresien-Square during the mass pillow fight event in Vienna, Austria on April 6, 2013, the International Pillow Fight Day.

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day.

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day.

Photo: CARL COURT, AFP/Getty Images

Revellers take part in a mass pillow fight in Trafalgar Square in... Photo-4433541.59865 - Houston Chronicle

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Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day.

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day.

Photo: CARL COURT, AFP/Getty Images

Revellers take part in a mass pillow fight in Trafalgar Square in... Photo-4433542.59865 - Houston Chronicle

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Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England.

Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 6, 2013 in London, England.

Photo: Oli Scarff, Getty Images

Revellers take part in a giant pillow fight in Trafalgar Square on... Photo-4433543.59865 - Houston Chronicle

Image 16 of 23

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day.

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day.

Photo: CARL COURT, AFP/Getty Images

Revellers take part in a mass pillow fight in Trafalgar Square in... Photo-4433544.59865 - Houston Chronicle

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A young woman reacts as she takes part in the mass pillow fight event in Vienna, Austria on April 6, 2013 as part of the International Pillow Fight Day.

A young woman reacts as she takes part in the mass pillow fight event in Vienna, Austria on April 6, 2013 as part of the International Pillow Fight Day.

Photo: ALEXANDER KLEIN, AFP/Getty Images

A young woman reacts as she takes part in the mass pillow fight... Photo-4433547.59865 - Houston Chronicle

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Feathers fly around while people take part in the mass pillow fight event in Vienna, Austria on April 6, 2013, the International Pillow Fight Day.

Feathers fly around while people take part in the mass pillow fight event in Vienna, Austria on April 6, 2013, the International Pillow Fight Day.

Photo: ALEXANDER KLEIN, AFP/Getty Images

Feathers fly around while people take part in the mass pillow fight... Photo-4433549.59865 - Houston Chronicle

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Feathers fly around while people take part in the mass pillow fight event in Vienna, Austria on April 6, 2013, the International Pillow Fight Day.

Feathers fly around while people take part in the mass pillow fight event in Vienna, Austria on April 6, 2013, the International Pillow Fight Day.

Photo: ALEXANDER KLEIN, AFP/Getty Images

Feathers fly around while people take part in the mass pillow fight... Photo-4433550.59865 - Houston Chronicle

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People take part in a pillow fight in Trafalgar Square, London, Saturday, April 6, 2013. A coordinated set of pillow fights took place in cities around the world on Saturday. The organizers of the London event stated there are only two rules don't hit anyone with a camera and don't hit anyone without a pillow. less

People take part in a pillow fight in Trafalgar Square, London, Saturday, April 6, 2013. A coordinated set of pillow fights took place in cities around the world on Saturday. The organizers of the London ... more

Photo: Matt Dunham, Associated Press

People take part in a pillow fight in Trafalgar Square, London,... Photo-4433551.59865 - Houston Chronicle

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People take part in a pillow fight in Trafalgar Square in London, Saturday, April 6, 2013.

People take part in a pillow fight in Trafalgar Square in London, Saturday, April 6, 2013.

Photo: Matt Dunham, Associated Press

People take part in a pillow fight in Trafalgar Square in London,... Photo-4433552.59865 - Houston Chronicle

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A woman makes a "feather angel" as she takes part in a pillow fight in Trafalgar Square in London, Saturday, April 6, 2013.

A woman makes a "feather angel" as she takes part in a pillow fight in Trafalgar Square in London, Saturday, April 6, 2013.

Photo: Matt Dunham, Associated Press

A woman makes a "feather angel" as she takes part in a... Photo-4433554.59865 - Houston Chronicle